A ray of light is incident on one face of a prism `(mu = 1.5)` at an angle of `60^(@)`. The refracting angle of the prism is also `60^(@)`. Find the angle of emergence and the angle of deviation. Is there any other angle of incidence, which will produce the same deviation?

Explanation

`sinr_(1)=(sini)/(mu)=(sin60^(@))/(1.5)=(sqrt(3))/(2xx1.5)=0.577`
`r_(1)=sin^(-1)(0.577)=35^(@),r_(2)=A-r_(1)=60^(@)-35^(@)=25^(@)`
`sine=mu sinr_(2)=1.5sin(25^(@))=1.5xx0.423`
`sine=0.634impliese=sin^(-1)(0.634)=39^(@)`
`Now, i+e=A+delta`
`impliesdelta=i+e-A=60^(@)+39^(@)-60^(@)=39^(@)` .